Stefan Sandreuter 16 GE354 Outline Formation of Cape Cod Nantucket and Marthas Vineyard Regional Deposits PostGlacial Holocene Processes Summary Formation of Cape Cod Nantucket and Marthas Vineyard ID: 438907
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Glacial History of Cape Cod, Nantucket, and Martha’s Vineyard
Stefan Sandreuter ‘16
GE354Slide2
Outline
Formation of Cape Cod, Nantucket and Martha’s VineyardRegional DepositsPost-Glacial Holocene Processes
SummarySlide3Slide4
Formation of Cape Cod, Nantucket and Martha’s Vineyard
Three lobes of glacial iceFluctuating Ice FrontEvidenced by till overlying stratified drift; recessional morainesSlide5Slide6Slide7Slide8
Regional Deposits
Types of depositsGeneral StratigraphyAge of DepositsCosmogenic
Nuclide Dating
MineralogySlide9Slide10Slide11Slide12Slide13
Cosmogenic
Nuclide Ages
Martha’s Vineyard
Buzzard’s Bay
*Radiocarbon dates put glacial deposits between 24,000 and 21,500 years old.Slide14Slide15Slide16
Post-Glacial Holocene Processes
Marine and Aeolian ProcessesTwo periods of Holocene modification9,500 – 6,000 B.P6,000 B.P. to modern daySlide17Slide18Slide19
Summary
Three lobes of iceFluctuating ice sheetNantucket and Martha’s Vineyard - terminal moraines of the Laurentide Ice SheetSlide20
Summary
Cosmogenic nuclide ages of ~23,000 and 19,000 years from Martha’s Vineyard and Buzzards Bay respectivelySubarkose and quartz arenite
sands from both outwash plains and beaches
Constant marine and
aeolian
modificationSlide21
Questions?